[cros,de-hack] Get rid of singleton for the WebUILoginScreen.

chrome/browser/ui/webui/chromeos/login/eula_screen_handler.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/chromeos/login/eula_screen_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 118 matching lines @@
     NOTREACHED();
 
   if (!delegate_)
     return;
 
   delegate_->OnExit(accepted, is_usage_stats_checked);
 }
 
 void EulaScreenHandler::HandleOnLearnMore(const base::ListValue* args) {
   if (!help_app_.get()) {
-    views::Widget* login_window = WebUILoginDisplay::GetLoginWindow();
-    help_app_ = new HelpAppLauncher(login_window->GetNativeWindow());
+    help_app_ = new HelpAppLauncher(GetNativeWindow());
   }
   help_app_->ShowHelpTopic(HelpAppLauncher::HELP_STATS_USAGE);
 }
 
 void EulaScreenHandler::HandleOnTpmPopupOpened(const base::ListValue* args) {
   if (!delegate_)
     return;
   delegate_->InitiatePasswordFetch();
 }
 
 }  // namespace chromeos